Ok, The PVC status would never go down till the switch reports it as down,
and only then will the line protocol go down.

I have come across this scenario a couple of times (with ATM, concept is the
same). And the trick is to use a routing protocol between the 2 routers, a
routing protocol senses that the keepalives / hellos are not being answered
and so will consider the neighbor as down, and in turn will activate the
isdn circuit.

You could also use dialer watch, watch a route and if that route goes down
(when one end of the frame goes down) activate the isdn.

hth
Nick


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